Revert "Makefile: Optimize optimization flags"

This reverts commit 2983055d0b5eeb3a92c9c61fc439578807c34114.
Revert "Makefile: add to O3 fno-inline-functions can help with 4.8.x Linaro"

This reverts commit 95435470bd0ab942380aaee24b311e5eca794d48.
Revert "Stupid warnings (4.8+)"

This reverts commit 07a341e912a49bfceaf94c6accc1a7ac29ebb9de.
fix